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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b3e112f88b5f53ff7083f1155e16cda9269d422f3fc5cb47f4c2113878b136' 
  AND token = 'hgyeBNLPm+ej4PPA3Bo8GPqm6E4KPiouuetRASPgqLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}